Safety switch



Oct. 29, 1929-. E. G. JOHgmssoN 1,733,126

SAFETY s wx r cu Original Filed A ril 2. 1926 2 SheetswShet 1 INVENTORATTORNEY Patented Oct. 29, 1929 UNITED STATES PATE NT OFFICE ERNEST G.JOHANSSON, OF WATERTOWN, MASSACHUSETTS, ASSIGNOR TO THE PALMER ELECTRIC& MANUFACTURING 00., OF WALTHAM, MASSACHUSETTS, A CORPORA- TION OFMASSACHUSETTS SAFETY SWITCH Original application filed April 2, 1926,Serial No. 99,391. Divided and this application filed. June 13,

1928. Serial My inventionrelates to safety switches for controllingelectrio circuits and automatic cutouts associated therewith and has forits objectto provide a new and improved switch mechanism adapted forsafety switches, whose switch arm when actuated so as to move to andfrom the cover of the casing, is more accurately guided and easilyassembled. It further has for its object to provide a switch in whichthe switch arm is actuated in both directions by a pivoted bail and iseasily assembled therewith and separated therefrom.

' The following is a description of an embodiment of my invention,reference being a had to the accompaying drawings, in which:

Figure 1 is a front elevation of a safety switch with the cover turnedon its hinges so as to be removed from the body of the casing and exposethe interior thereof;

Fig. 2 is a section of the internal switch mechanism on the line 22,Fig. 1, with the switch mechanism in closed position; and 4 V Fig. 3 isa sectional view of the same on the line 33, Fig. 1, with the parts inopen position.

Referring more particularly to the draw-, ings, 2 is the body portion ofthe casing of the safety switch. 4 is the main cover hinged thereto at6. 44 is the external handle of an interior'oscillating bail foractuating the internal switch mechanism, the same being pivotallymounted in the side wall of the case at 46. 48 is a stop guard for thishandle. The internal switch mechanism actuated by the handle 44consists'of a base of insulating material 78 secured to the rear wall ofthe body portion of the casing by screws 80. Secured to this base memberis 'a metallic plate 82 carrying two parallel guide rods 84 on which isslidingly mounted a molded'switch arm block 86, carrying portions 87rojecting' fromits body portion and closely tting the guide rods 84.These portions 87 may be intogral with the body portion 86 is desired.Mounted upon this switch arm block is an automatic cutout in the presentinstance, shown as a fuse 89, engaging terminals 88 and 90 of a fusereceptacle, which terminals are respectively connected to the endportions 92-and 94 of a switch arm whose parallel extremities areadapted to engage and disengage corresponding switch contacts 96 and 98mounted upon the base 78. This switch block together with its switch armand automatic cutout is reciprocated along the guide rods 84 by the bail100 which is actuated by the handle 44. In order to removably connectthe bail with the switch block I mount upon the lower portion of theswitch block a metal hook 102 with which the transverse portion of thebail 100 is always in engagement when the parts are assembled. When,however, the screws 80 are removed so that the base 78 can be movedrelatively to the casing a slight I movement upward of the base with theparts carried thereby will cause the hook 102 to disengage the bail 100.The main cover of the switch being open, the switch block can then bedrawn ofi the guide rods 84 and the switch base with its other partseasily removed from the casing, thus providing a simple means forassembling and disassembling the interior switch mechanism from thecasing and from the actuating member. Under normal conditions the bailprevents the removal of the switch block and limits its outward movementat a pointwhere its surface 86' is closely adjacent to the inner surfaceof the cover. as shown in Fig. 3.

In addition to the switch contacts the base 7 8'carries various otherbinding posts as indicated at 110, 111, 112 and 113, and adetachablelink 114 for the usual meter connecting and testing circuits,as is well understood by those skilled in the art.

This application is a division of my copending application, Serial No.99,391, filed April 2, 1926. I

As will be evident-to those skilled in the art, my invention permitsvarious modificacover, switch, contacts mounted upon said base memberand insulated from one another, a switch arm block comprising a block ofmolded insulating material and carrying projections having openingsfitting said rods and slidingly mounted thereon, a switch arm carried bysaid block and adapted to engage and disengage said switch contacts, apivotally mounted bail for reciprocating said block upon said rods, saidswitch arm block having on its rear side a member having a laterallyextending recess and engaging said bail.

2. In a switch, the combination of a casing having a cover, a basemember removably mounted therein, a plurality of rods secured theretoand extending toward said cover, switch contacts mounted upon said basemember and insulated from one another, a switch arm block comprising abody of molded insulating material slidingly mounted on said rods, aconducting member carried by said block and adapted to engage anddisengage said switch contacts, a pivotally mounted bail forreciprocating said block upon said rods, said switch arm block having alaterally extending hook on its rear side adapted to be engaged with anddisengaged from said bail by a relative movement when said base isdetached from said casing, and said switch arm block being held on saidrods by said bail and free to be drawn ofi said rods when said bail isdisengaged from said hook.

3. In a switch, the combination of a base member, a plurality of rodsextending outwardly therefrom, switch contacts mounted engage saidswitch contacts, a pivotally mounted bail for reciprocating said blockupon said rods, said switch arm block having a laterally extending hookon its rear side adapted to be engaged with and disengaged from saidbail by, a relative sidewise movement when said base is detached fromsaid casing.

5. In a switch, the combinatiin of a casing having a cover, a basemember removably mounted therein, a plurality of guide rods securedthereto and extending toward said cover, a switch arm block ofinsulating material slidingly mounted on said guide rods, an actuatingbail mounted on the side walls ofsaid casing, said switch arm blockhaving a hook on its rear side extending beneath said bail and adaptedto be engaged with and disengaged from said bail by a relative sidewisemovement when said base is detached from said casing.

In testimony whereof, I have signed my name to this specification this25th day of May, 1928. v v

ERNEST G. JOHANSSON.

upon said base member and insulated from one another, a switch arm blockcomprising a body of molded insulating material and having verticalprojections provided with openings fitting said rods and slidinglymounted thereon, a conducting switch arm carried by said block andadapted to engage and disengage said terminals, and a pivotally mountedbail for reciprocating said switch arm block and switch arm upon saidrods, said switch arm block having a laterally extending hook on itsrear side adapted to be engaged with and disengaged from said bail whensaid base is detached from said casing, I and said switch arm blockbeing held on said rods by'said bail and free to be drawn ofi said rodswhen said bail is disengaged from said hook, said switch arm blockhaving fuse terminals connected respectively to the end portions of saidswitch arm.

4.'In a switch, the combination of a casin having a cover, a base memberremovab y mounted therein, a plurality of rods secured thereto andextending toward said cover, switch contacts mounted upon said basemember and insulated from one another, a switch arm block of moldedinsulating material having openings formed in said insulating materialand fitting said rods and slidingly mounted thereon, a'switch armcarried by said block and adapted to engage and dis-

